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Numi Beam Lessons and Work in Progress Minos/Minos+ Dr. Anna Holin NUMI BEAM LESSONS AND WORK IN PROGRESS MINOS/MINOS+ Anna Holin 27 Nov 2017 CERN CENF-ND Meeting Dr. Anna Holin 2 The NuMI Beam • 120 GeV protons from the Main Injector impact on a graphite target • The resulting hadrons are focused by two magnetic horns • They decay into neutrinos and other particles in the decay pipe • The absorber and the subsequent rock absorb the latter, leaving only the neutrinos to travel towards the detectors Dr. Anna Holin 3 The MINOS/MINOS+ Experiment Far Detector Near Detector • MINOS is the oldest experiment in the NuMI Beam - it took beam data 2005-2016 • The ND still exists and serves as a beam monitoring device for NOvA and MINERvA • MINOS is On-Axis, seeing a wide spectrum beam • MINOS’s Far /Near capabilities really helped with measuring the oscillation parameters, due to many systematic errors cancelling, including flux systematics Dr. Anna Holin 4 A few words • I would like to discuss the value of knowing the neutrino beam flux as best we can • A Near Detector is the best tool to help understand the beam flux • It can serve to cancel systematic errors on the beam flux (and other errors like cross-sections etc) • But the cancellation is not perfect as the ND is much closer to the beam source and sees neutrinos from a different pt-pz space than a FD • A ND is essential because our flux modelling is imperfect • The more instrumentation one can put in the beam the better Dr. Anna Holin 5 Oscillation analysis in simple terms Near Detector Data MC Decompose Near Extrapolate Detector data them to the Far spectrum into Detector individual individually components Far Detector Compare FD Prediction with FD Far/Near ratio Data Get oscillated FD Prediction Dr. Anna Holin 6 Oscillation analysis in simple terms Near Detector Data MC Decompose Near Extrapolate Detector data them to the Far spectrum into Detector individual individually components Far Detector Compare FD Prediction with FD Far/Near ratio Data Get oscillated FD Prediction Dr. Anna Holin 7 Beam Systematic Errors Cancellation • To evaluate most beam flux systematic errors, special flux samples are generated where the given systematic is shifted by its associated uncertainty • Systematic errors cancel to a large extent when taking a Far/Near ratio in a standard analysis • e.g. 5% errors in one detector become 2% in F/N, 8% becomes 3% • This is a huge advantage of a two detector experiment, however, we need to understand flux much better for future precision measurements Dr. Anna Holin 8 Beam Flux from a Target LE Target • Sometimes there can be a misconception that just because we have measured hadron production from thin target experiments, we understand it for any target (e.g. thick targets) • This is not so - experiments spend a lot of time trying to understand their neutrino flux and it is a very difficult problem to solve • Furthermore, hadron production in targets changes depending on the target geometry • It is vital to know the flux from the actual target that is being used ME Target Dr. Anna Holin 9 Horn Off Comparison • The Horn Off sample (where the horns were not switched on) has no focusing, pure hadron production, we can use it to check whether the difference in hadron production between the LE and ME targets is well modelled • The MC does not model the difference between the LE and ME target very well as can be seen from the data/MC ME/LE double ratio - would expect it to be 1.0 (even if the data/MC agreement itself is imperfect) Dr. Anna Holin 10 Data / MC agreement in MINOS(+) • The Near Detector is the best beam flux monitoring device we have for the NuMI Beam MINOS+ Preliminary • But the data/MC agreement out of the box is not fantastic, especially at the falling edge of the beam peak • Traditionally, for the standard 3-flavour oscillations analyses, it did not really matter since we use the ND data to predict the FD spectrum MINOS LE • Also, we were able to correct the MC spectrum to achieve good data/MC agreement by using a beam fitting procedure Dr. Anna Holin 11 Beam Realities • When we observe the beam in the Near Detector, there are several effects that are entangled: • Hadron production - those are the hadrons that are produced in the beam target, before being focused • Focusing Effects - when the horns are on, hadrons are focused (or out- focused) depending on their charge and the sign of the horn current • Neutrino cross-section in the ND • Possible detector effects, including detector acceptance, and detector occupancy effects • All of those need to be disentangled! Dr. Anna Holin 12 What happens in the Beam Fits • During beam fits, we normally include several beam configurations so as to disentangle those effects, and access different phase space in neutrino parent pT/pZ ND MC Dr. Anna Holin 13 What happens in the Beam Fits • A particularly important sample is the Horn Off sample, where the horns are not switched on which means that there are no focusing effects there • Using several beam configurations also allows to cancel out detector effects in the fits • We fit 3 parts (normally) at the same time: • Hadron production • Focusing effects • “detector” effects which include some background, energy mis-calibration and cross- section effects and are expected to be small Dr. Anna Holin 14 Beam Fitting - Hadron Production • Traditionally, for the 3-flavour analysis, we have been using a fitting framework developed early on for MINOS (see Zarko Pavlovic Thesis) • This uses a BMPT-type parametrisation in order to fit the hadron production part of the neutrino flux Fitting of parametrisation to flux MC (hadron production off NuMI target) Dr. Anna Holin 15 Beam Fitting - Hadron Production Step 2 • Once the hadron production has been fitted, the resulting parametrisation can be used to calculate weights as a function of neutrino parent pt-pz (the parent as it exits the target, before any focusing) • Those weights are extracted by fitting ND MC to ND Data to improve Data/MC agreement • The weights are calculated as a ratio, therefore the parametrisation serves as a handle to warp the hadron production Dr. Anna Holin 16 Beam Focusing • Over the running of MINOS we have evolved the flux fits so as to fit two focusing parameters as effective parameters • They go in opposite directions and provide a nice handle to fit the falling edge of the peak • We already used them in MINOS LE, and are using them in MINOS ME too • Fit them in terms of +/- sigma applied as weights in true neutrino energy to MC Dr. Anna Holin 17 Some beam fit results • These are the results of the current official MINOS+ beam fits • Those ME fits used four samples: Horn On Neutrinos, Horn On Anti-Neutrinos, Horn Off Neutrinos, Horn Off Anti-Neutrinos ME Horn On ME Horn Off Dr. Anna Holin 18 Effect of Hadron Production Only • It is possible to apply only part of the weights after having extracted the fit parameters, to see what contribution the different components make to the final data/MC agreement • Applying only the Hadron Production weights ME Horn On ME Horn Off Dr. Anna Holin 19 Effect of Focusing Only • It is possible to apply only part of the weights after having extracted the fit parameters, to see what contribution the different components make to the final data/MC agreement • Applying only the focusing weights - no effect on Horn Off sample - good sanity check ME Horn On ME Horn Off blue hiding behind red Dr. Anna Holin 20 Effect of both Hadron Production and Focusing • Applying both the Hadron Production weights and the Focusing weights yields good data/MC agreement ME Horn On ME Horn Off Dr. Anna Holin 21 Some Comments • We can fit the data / MC disagreement out by fitting the hadron production in parent hadron pT-pZ space (as the parent hadron exits the target) and using focusing systematics • To date, the focusing component required is large and not understood though we are slowly making progress towards this goal • None of this really mattered for the MINOS LE or ME standard oscillations (3- flavour) numu-CC disappearance analysis • This is because we could take the ND as the un-oscillated sample to get the FD oscillated prediction • MINOS ran checks on the FD oscillations results with/without beam flux weights and the results were practically identical Dr. Anna Holin 22 Impact on Analyses • However, there are other analyses apart from the standard disappearance • The electron neutrino appearance analysis for example - with higher statistic we will need to understand any focusing or hadron production effects, including those affecting the intrinsic beam nue background and also the beam peak • We can’t afford to have a 1GeV peak shift between data and MC for the high precision DUNE measurements - we really need to understand the flux very well • What about other methods of getting the flux? • Currently on MINOS(+) we are using PPFX as an a priori flux for the sterile analysis since using the standard beam weights can’t be used here since that would be using flux derived from the same data set that we are using to look for a sterile neutrino Dr. Anna Holin 23 PPFX a priori flux • MINERvA have calculated a flux spectrum based on external hadron production data (https://arxiv.org/pdf/ 1607.00704.pdf) • They used the external data to calculate an a-priori flux from the NuMI target - now used by NOvA and the MINOS sterile analysis • The calculated thin target flux mostly uses NA49 data, the thick target flux mostly MIPP, but they have used other external data to fill out gaps in phase space where one or the other data was missing • They used their own data (with tracks ranging out in the MINOS ND) to evaluate the data/MC agreement after applying their correction to their MC from the calculated flux MINERvA have calculated fluxes based on external hadron production data: Dr.
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